This study was carried out in an attempt to develop and evaluate an instrument which would satisfactorily measure die strength of elbow flexion of boys and girls in grades three, four, five and six. Elbow flexion was chosen as an important element of total strength and as a factor in many of the activities in which children participate. The bar-scale apparatus used in this study consisted of either a Chatillon spring scale or a regular bathroom scale and a portable chinning bar set in a doorway. The test using this apparatus was administered to 112 children and evaluated for reliability, validity and objectivity. Since strength varies widely in children of different ages and between the sexes, the evaluation was done separately by grade and sex. A cable-tension test of elbow flexion strength was used as the criterion for the validity coefficients
